“If we went out to eat I’d wonder if she and her previous partner had been to the same restaurant.

“We’d walk by a hotel and suddenly I’d wonder if they had made love there.”

Instead of healthy chats, it turns into interrogation over former lovers.

Social media can make it very hard to keep old flames private, with photos, comments and posts all offering an insight into someone’s life.

We’d walk by a hotel and suddenly I’d wonder if they had made love there

It can end up becoming a fixation, as Zachary, from Canada, continued: “I’d scroll through old photos from before I knew her, reading comments, trying to figure out who certain people were, how they fitted into her life, whether there was an untold adventure from her past.

“I would question my girlfriend incessantly.

“I would try to make her feel guilty about having had relationships in the past.”

And 27-year-old Nicola told Refinery29: “I’ve read messages between them on his phone, and I check her social media profiles more regularly than I’d like to admit.

“At the beginning of our relationship I’d look back on old photos of them together, and it makes me feel really insecure that he’s been in a relationship with another girl, who has felt the same about him as I do.”